Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Senior Notes 2027 [Member]
Derivative Cash Flow Hedge [Line Items]
Notional value of derivative liability	$ 125,000,000		$ 125,000,000
Amount of hedged item	125,000,000		125,000,000
Gain (loss) expected to be reclassified as interest expense on derivative financial instruments designated as cash flow hedges, over the next twelve months	(100,000)
Loss reclassified to interest expense on derivative financial instruments designated as cash flow hedges	3,000
Loss on hedge from treasury lock transaction	700,000
Income tax benefit on losess from treasury lock transaction	300,000
Senior Notes 2023 [Member]
Derivative Cash Flow Hedge [Line Items]
Gain reclassified to interest expense on derivative financial instruments designated as cash flow hedges	50,000	$ 50,000	100,000	$ 100,000
Gain (loss) expected to be reclassified as interest expense on derivative financial instruments designated as cash flow hedges, over the next twelve months			200,000
Unamortized gain (loss) on interest rate lock			1,200,000
Senior Notes 2017 [Member]
Derivative Cash Flow Hedge [Line Items]
Unamortized gain (loss) on interest rate lock			(100,000)
Loss reclassified to interest expense on derivative financial instruments designated as cash flow hedges	$ 56,000	$ 56,000	$ 100,000	$ 100,000